Mechanical glass I-beam scale



FIG. 1 is a perspective plan view of the mechanical glass I-beam scale;

FIG. 2 is a front plan view;

FIG. 3 is a top view;

FIG. 4 is a right/left side view; and,

FIG. 5 is a bottom view. 

The ornamental design for a mechanical glass I-beam scale, as shown. 